Yeah, you're old school. Now they just list four new valve stems on the invoice and charge you for them even if they didn't replace them.
You're not just whistlin' Dixie. This happened to me at Big O on my old Fusion when I bought a couple of new tires in 2019, right before I sold it. The TPMS sensors are strapped around the wheel inside, not on the stems, and they charged me for the "TPMS Service." I didn't catch it until I got home, called the shop back and they said they'd refund the charge in the morning, they'd closed their books for the day. Never happened. I disputed the charge (it was on the Big O credit card) and got the refund. Jerks. That store no longer gets my business.